Why optimized version is slower than unoptimized?

dabasmoti · October 10, 2023, 9:34am

Hi,
I have very strange behavior.
I have really simple api with actix_web that return value from hashmap.
I made stress test with Jmeter on "unoptimized" version(cargo run) and it run very fast on multithreads.
But, after compiling(cargo build --release)
It run very slow compare to the "unoptimized" version.
here is the code:

gist.github.com

https://gist.github.com/dabasmoti/c87f94392e11f9d1384f734f639c1ee1

main.rs

use actix_web::{web, App, HttpResponse, HttpServer, Result, middleware};
use env_logger::Env;
use serde::{Deserialize, Serialize};
use serde_json::{Value, Map};
use std::error::Error;
use std::sync::{Arc, RwLock};
use std::fs;

#[derive(Debug, Serialize, Deserialize)]
struct RequestBody {

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